CN120134818A

CN120134818A - High drop, high color and high gloss injection panel painting process

Info

Publication number: CN120134818A
Application number: CN202510285400.XA
Authority: CN
Inventors: 胡江; 胡宇晨; 陆鼎; 朱怀强
Original assignee: Foshan Minbo Electronics Co ltd
Current assignee: Foshan Minbo Electronics Co ltd
Priority date: 2025-03-11
Filing date: 2025-03-11
Publication date: 2025-06-13

Abstract

The invention discloses a high-drop high-color high-gloss injection molding panel colored drawing process which comprises the following steps of S1, selecting ink with corresponding colors, placing the ink into corresponding ink boxes in a colored drawing machine, S2, placing a plastic panel on the colored drawing machine, carrying out ink-jet colored drawing on the plastic panel through a spray head, S3, carrying out UV (ultraviolet) curing after colored drawing is finished, wherein the ink comprises, by weight, 10-20 parts of inorganic pigment, 5-15 parts of ethoxyethoxy ethyl acrylate, 35-45 parts of 2-phenoxyethyl acrylate, 5-15 parts of N-vinyl caprolactam and 1-10 parts of dipropylene glycol diacrylate. The obtained pattern has good adhesive force, alcohol resistance, light resistance and damp-heat resistance on plastic parts, has the characteristic of high drop, and the colored pattern has the characteristics of high color, high gloss and high light transmittance, and has more various colors.

Description

High-drop high-color high-gloss injection molding panel colored drawing process

Technical Field

The invention belongs to a colored drawing process, and particularly relates to a colored drawing process of a high-drop high-color high-gloss injection molding panel.

Background

When different textures or patterns are needed for decoration of the existing plastic parts, a decoration film is usually directly adhered to the plastic panel, and some plastic panels are also directly painted. However, the existing patterns obtained by directly carrying out colored drawing on plastic parts are planar, lack of stereoscopic impression, insufficient adhesive force and alcohol resistance, and easy falling of the patterns, and if the patterns are printed by using the traditional printing method, VOC components in the printing ink can be volatilized continuously for a long time, so that environmental pollution is caused, peculiar smell exists, and the patterns on window positions cannot be realized due to poor light transmittance.

Disclosure of Invention

The invention aims to provide a high-drop high-color high-gloss injection molding panel colored drawing process capable of solving at least one of the problems.

According to one aspect of the invention, there is provided a high drop height high color high gloss injection molding panel painting process comprising the steps of:

s1, selecting ink with corresponding colors, and placing the ink into each corresponding ink box in a colored drawing machine;

S2, placing the plastic panel on a color drawing machine, and performing ink-jet color drawing on the plastic panel through a spray head of the color drawing machine;

s3, carrying out UV curing after the colored drawing is completed;

The ink in the step S1 is composed of the following components in parts by weight:

10-20 parts of inorganic pigment, 5-15 parts of ethoxyethoxyethyl acrylate, 35-45 parts of 2-phenoxyethyl acrylate, 5-15 parts of N-vinyl caprolactam and 1-10 parts of dipropylene glycol diacrylate.

In some embodiments, the color drawing machine in step S1 adopts a UV flat-panel inkjet machine, the number of nozzles is plural, two ink cartridges are installed at each nozzle, a controller is disposed on the color drawing machine, and each ink cartridge is electrically connected with the controller.

In some embodiments, a plurality of nozzles are installed at each nozzle, the number of the nozzles on each nozzle is 1280, and the ink droplet size ejected by the nozzles is 5-15 pl.

In some embodiments, the firing frequency of the spray head is 50KH or less.

In some embodiments, the spray head is capable of X-axis, Y-axis, and Z-axis movement on a UV flat panel inkjet.

In some embodiments, the texture resolution after spray head painting is 600dpi for single color and 300dpi for double color.

In some embodiments, one side of the spray head is provided with a UV curing lamp.

The beneficial effects of the invention are as follows:

1. the colored drawing ink has no Volatile Organic Compound (VOC) emission, does not generate VOC in the curing process, greatly reduces environmental pollution and avoids peculiar smell compared with solvent type ink used in the traditional printing process;

2. The patterns obtained by the ink colored drawing have good adhesive force, alcohol resistance, light resistance and damp-heat resistance on plastic parts;

3. The colored drawing pattern obtained by the process has the characteristic of high fall, namely, the high-precision pattern with the fall of 0-15 mm can be achieved;

4. After colored drawing, the patterns are directly cured by a UV curing lamp, so that the processing efficiency is greatly improved;

5. the minimum ink drop size can reach 5pl, the injection precision is high, high-definition printing can be realized at 600dpi, the ignition frequency of the nozzle is as high as 50KH, and the production efficiency can be greatly improved;

6. The pattern layer obtained by colored drawing has high light transmission characteristic, and can realize the display window pattern.

Drawings

Fig. 1 is an effect diagram of a colored pattern obtained by the colored process of the present invention.

Fig. 2 is a diagram showing the effect of a pattern according to the prior art.

FIG. 3 is a view of a color pattern obtained by the color process of the present invention

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings.

Example 1

The invention relates to a high-drop high-color high-gloss injection molding panel colored drawing process, which comprises the following steps of:

s3, carrying out UV curing after the colored drawing is completed;

15 parts of inorganic pigment, 10 parts of ethoxyethoxyethyl acrylate, 40 parts of 2-phenoxyethyl acrylate, 10 parts of N-vinyl caprolactam and 5 parts of dipropylene glycol diacrylate.

Wherein, the ethoxyethoxyethyl acrylate is 2- (2-ethoxyethoxy) ethacrylic acid, and the CAS number is 7328-17-8;

2-phenoxyethyl acrylate with CAS number 48145-04-6;

n-vinyl caprolactam having a CAS number of 2235-00-9;

Dipropylene glycol diacrylate with CAS number 57472-68-1.

The inorganic pigment is selected so that the pigment does not contain volatile organic compounds, and other components in the ink do not contain VOC components of the organic compounds, so that the ink does not emit harmful components such as VOC after being sprayed, the environmental pollution is greatly reduced, and the environmental protection effect is achieved.

The patterns obtained by the ink colored drawing have the characteristics of water resistance, sun resistance and scratch resistance after being rapidly cured by UV, the service life of the product is prolonged, and the stable color and performance can be maintained in the long-term use process.

The color drawing machine in the step S1 adopts a UV flat-plate spray drawing machine, a plurality of spray heads are adopted, two ink boxes are arranged at each spray head, a controller is arranged on the color drawing machine, and each ink box is electrically connected with the controller. In actual use, the controller controls the ejection amount of the ink in each ink box, so that patterns with different colors can be obtained by colored drawing. The controller controls the ink ejection amount of each ink cartridge as in the prior art, and detailed control procedures are not described here.

And a plurality of nozzles are arranged at each nozzle, the number of the nozzles on each nozzle is 1280, and the ink drops ejected by the nozzles are 5-15 PL. In actual use, the number of the spray heads can be 4, and 1280 spray nozzles on each spray head are configured, so that ink drops are small and fine.

In the process of colored drawing, the size of the ejected ink drops can be as small as 5pl, the ejection precision is high, high-definition printing can be realized at 600dpi by single color, and the resolution can be 300dpi in the process of double color, so that the pattern obtained by colored drawing has high resolution, and the surface of the cured colored drawing layer is smooth, has high glossiness and has excellent wear resistance, weather resistance and chemical resistance.

The spray head can move in the X-axis direction, the Y-axis direction and the Z-axis direction on the UV flat-panel spray painting machine. The movement control mode of the spray head on the UV flat-plate spray painting machine is the prior art and is not repeated here. Through X, Y of the spray head and Z-axis direction movement, spray painting of different positions of the plastic panel can be realized.

The ignition frequency of the spray head can reach 50KH, so that the ink-jet efficiency of the spray head is greatly improved, and the production efficiency can be greatly improved. The UV curing lamp is arranged on one side of the spray head, so that after the spray head finishes the inkjet painting, the painting part is directly cured through the UV curing lamp, the cured ink has no peculiar smell, the curing efficiency is high, the curing can be finished in a few seconds, and the production period is greatly shortened.

In practical use, the process can print different materials such as metal, ceramic and the like except the plastic panel, has enough adhesive force with the materials such as metal, ceramic and the like, and has good alcohol resistance.

The colored drawing pattern (shown in figure 1) obtained by the colored drawing process of the high-drop high-color high-gloss injection molding panel can achieve the effect of high drop, the pattern drop can be in the range of 0-15 mm, the three-dimensional effect is good, the pattern with high precision and high resolution is obtained, the diversity of colors of the colored drawing pattern can be achieved through a plurality of spray heads and a plurality of ink boxes, the high-gloss full coverage of the pattern is achieved, the pattern layer obtained by colored drawing has high light transmission property, the display window pattern (shown in figure 3) can be achieved, compared with figures 2 and 3, the pattern layer obtained by the process of the application has better light transmission effect, meanwhile, the adhesive force of ink and a plastic panel is greatly enhanced, the hardness of the colored drawing layer is ensured, the pollution to the environment in the printing process is reduced, the effect of environmental protection is achieved, and the characteristics of good weather resistance, moisture resistance, water resistance and the like are achieved. The color painting textures on the plastic panel are correspondingly tested, and the results are referred to in the following table:

Example 2

This example is essentially identical to example 1 and achieves the same properties as example 1, except that the ink in step S1 consists of the following components in parts by weight:

10 parts of inorganic pigment, 5 parts of ethoxyethoxyethyl acrylate, 35 parts of 2-phenoxyethyl acrylate, 5 parts of N-vinyl caprolactam and 1 part of dipropylene glycol diacrylate.

Example 3

20 parts of inorganic pigment, 15 parts of ethoxyethoxyethyl acrylate, 45 parts of 2-phenoxyethyl acrylate, 15 parts of N-vinyl caprolactam and 10 parts of dipropylene glycol diacrylate.

The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and improvements could be made by those skilled in the art without departing from the inventive concept, which fall within the scope of the present invention.

Claims

1. A high drop, high color and high gloss injection panel painting process, characterized in that it includes the following steps:

S1. Select ink of corresponding color and put it into the corresponding ink cartridges in the color plotter;

S2, placing the plastic panel on a painting machine, and performing inkjet painting on the plastic panel through a nozzle of the painting machine;

S3, UV curing after painting;

The ink in step S1 is composed of the following components in parts by weight:

10 to 20 parts of inorganic pigments, 5 to 15 parts of ethoxyethoxyethyl acrylate, 35 to 45 parts of 2-phenoxyethyl acrylate, 5 to 15 parts of N-vinyl caprolactam and 1 to 10 parts of dipropylene glycol diacrylate.

2. The high-drop, high-color, and high-gloss injection molding panel painting process according to claim 1 is characterized in that the painting machine in step S1 adopts a UV flatbed inkjet printer, has multiple nozzles, and each nozzle is equipped with two ink cartridges. The painting machine is provided with a controller, and each of the ink cartridges is electrically connected to the controller.

3. The high-drop, high-color, and high-gloss injection molding panel painting process according to claim 2 is characterized in that a plurality of nozzles are installed at each of the nozzles, the number of nozzles on each nozzle is 1280, and the ink droplet size sprayed by the nozzle is 5 to 15 PL.

4. The high-drop, high-color, and high-gloss injection panel painting process according to claim 3 is characterized in that the ignition frequency of the nozzle is ≤50KH.

5. The high-drop, high-color, and high-gloss injection panel painting process according to any one of claims 2 to 4, characterized in that the nozzle can move in the X-axis direction, the Y-axis direction, and the Z-axis direction on the UV flatbed inkjet printer.

6. The high-drop, high-color, and high-gloss injection molding panel painting process according to claim 5 is characterized in that the texture resolution after the nozzle is sprayed is 600dpi for single color and 300dpi for two colors.

7. The high-drop, high-color, and high-gloss injection molding panel painting process according to claim 2, characterized in that a UV curing lamp is provided on one side of the nozzle.